The Holman Projector was introduced by the British military in 1940. Mounted on ships, it used compressed air or steam to launch hand grenades at enemy aircraft. Though it rarely hit them, the grenades it launched produced deceptively large clouds of smoke that gave enemies the impression that a much more deadly weapon was firing upon them. A demonstration of the gun for Winston Churchill was once nearly scrapped for want of grenades but was saved when what unusual ordinance was supplied? Discuss